Can Light Wave Interference Affect Our Perception of Stars?

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Discussion Overview

The discussion revolves around the concept of light wave interference and its potential effects on our perception of stars. Participants explore whether interference patterns from light emitted by distant stars could lead to misinterpretations of their positions or appearances.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions if light from ancient stars could interfere with light from other sources, potentially causing a distorted perception of their positions.
  • Another participant asserts that light from different sources does not interfere, contrasting this with the conditions of a double-slit experiment.
  • It is noted that multiple light beams can coexist without interference, similar to waves on a pond, and that interference typically occurs when light waves are in phase from the same source.
  • A participant mentions that while photon interference does not alter their direction, gravitational fields can affect light paths, although this effect is minimal and often disregarded.
  • One participant emphasizes that for interference to occur, coherent phase relationships are necessary, which is absent in the random nature of starlight.

Areas of Agreement / Disagreement

Participants generally disagree on the implications of light interference from stars, with some asserting that it does not affect perception while others propose that it could. The discussion remains unresolved regarding the extent to which interference might influence our observations.

Contextual Notes

Participants highlight the need for coherent phase relationships for interference, the influence of gravitational fields, and the role of the interstellar medium, but do not reach a consensus on the overall impact on star perception.

VyR
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Hi all.

Its my first post here...

Would just like to ask about the light wave interference patterns of light. I just occurred to me about the light coming from the eon-old stars interfering with light from another... Would it cause a magnified ripple that would cause us to wrongly see the stars or their positions?

Thanks.
 
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Welcome to PF!

As far as I know, light from one source does not interfere with light from another.

That is not the same thing as a "double-slit" experiment.

In any event, I'm sure there is more to this. Perhaps others more knowlegeable can answer more clearly.
 
Yes, any number of light beams (or photons) can pass through the same point without interfering with each other. In that sense, it's just like waves on a pond.

You only get interference when light waves are in phase - normally because they're coming from the same source - a la a two-slit setup.
 
The interference of photon photon does not change their direction, so star observed wil not be influenced by this. They will be influenced by any gravitational field they pass through, so for extremely exact measurements one has to take that into account ( nobody bothers as it is a very small effect). Plus that any magnetic or electric field has the potential to twist the plane of polarization of any photon passing through, but not the direction ( might be wrong about this). If you add refraction of the unseen interstellar medium (e.g. hidrogen gas around or solar system) to the fact that the star moved quite a bit from the time it emitted the observable light, it's quite clear that nobody will ever know the exact position of any star.
 
In order for interference to happen, there needs to be a coherent phase to the light beams - there isn't. Light from a star is just a bunch of random photons.
 

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